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Hi
Can you make clear your test case ?
I guess you connected 0.33R to power module then turn on AC input.
If you do like that, the power started with heavy load. Each SMPS power module limited peak output current or output capacitor or soft-start time, if these condition are not met, controller...
In LTspice, you can change K L3 L4 0.99, the mutual ration between coils.
You know that, in transformer model. L_leak is not mean serial inductor L_ser as you inserted in Ltspice. You worked and design with LLC, same calculate form was built also. Normally, L_leak ~= L_ser, so for quickly...
Hi
You can add me taihung7z@gmail.com. I am not so friendly with EasyEDA. I often using KiCad. But, I tried before.
For switching frequency, the story you may heard some where that increase it will maybe increase more noisy. That is only a half of story. The rest half story, it will reduce...
Hi
Yes, you improved layout abit. From your side it maybe not clear all "trick" to do with design.
I really don't like using vias in power application and "auto stiching vias feature"
Your current paths is still not perfect yet.
You did not separate power GND vs signal GND. The GND can...
Yes, it use only for ion metal only. With new coil has same inductance as old one. Base on magnetic effect.
Can not apply for other metal like: alu, copper, gold, silver , ... because these metal request other method to heat up - Foucault current with higher frequency. If metal like gold is...
Hi
Your spike voltage cause from layout.
I just rebuild your design in LTspice - simulation as below, with same condition (300kHz, 10uH:10uH). I just add very small leak inductor on Trace & Mosfet, spike voltage will appear and peak to 40V. The Ipp = ~4.5A.
The FFT show that circuit has resonant...
Hi
With low voltage as 9-30V, the dv/dt is quite low. So, when you failed with 0R/10R Rg, it maybe problem with Mosfet optimize and set point of operation.
Manufacturers as Infineon (IFX), NXP, Onsemi, Nexperia, Alpha Omega, Ti, ... had optimize many Mosfet to fit many design application. But...
Hi
I will not use SEPIC for high power > 10W, as its ripple current too high and low efficiency.
The most advantage of SEPIC is safety when have trouble will controller, Input will not connect directly to Ouput.
I suggest you change to BUCK & BOOST (not BUCK-BOOST topology, as my tested real...
Hi
Change the ratio of R1&R2 for voltage in scale of ADC.
Reduce R3 < 1k Ohm, and add Ca Capacitor for pin3 of ADC. R3 & C3 creat a LPF, which design for filter noise and cut off frequency higher than sample frequency of ADC. R3 too high will make drop voltage on it when has charge current input...
Hi
Max power = 21V x 200A = 4200W = 4.2kW
I suggested change voltage to 2kV, then Irms reduce to 2.1A -> metal of wire will be reduced more weight.
It is not DC 2kV, it is AC with 500kHz. Then on drone only need transformer + rectifier + supercap (or sub-battery to boost peak power).
Need a...
Hi
I am not sure about your question.
In spec, LTC/ADI mention their example circuit is OK - Opto is NPN with base is actived by energy of light.
Your circuit will not work properly. Because your comparator not use smithtrigger or latching type or like compensation (analog output).
The ouput...
Hi
Audible - noise mean something vibrated with frequency < 20kHz. Yes, it is not from Fsw >= 20kHz.
It is from control loop.
As you known, all PWM IC has its minimum on time, example 50ns is good.
Why need to take care of this ?
It related to minimum load can regulated with PWM.
If minimum load...
Hi
Simulation is not real, the transfer function of transformer is too sample. It is defined base on gain from inductance of two coils.
You can take a look about Remanence or remanent magnetization or residual magnetism.
It will happen near B_peak close B_max, when system near overload or...
Hi
It is called decoupling capacitor.
As you know, all component on PCB connect to each other by net/trace. They have their length and impedance.
Example 1, when output of opam change, it need more or reduce current. If has no near storage power like decouling cap, the current (trasition...
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